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      4-ton central heat pump · MAYTAG PSH4BF SERIES

      Maytag PSH4BF5M2SX48K

      Below average cooling and heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

      Ranks #254 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,500 a year to run in a mixed climate like Atlanta.

      SEER2
      16.0 Cooling efficiency over a season
      Below average · beats 26%
      HSPF2
      8.0 Heating efficiency over a season
      Below average · beats 12%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      25,400 BTU/h51% of its 47°F output
      Below average · beats 1%

      A good fit if…

      • You want a certified 4-ton central heat pump at a typical efficiency level.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • Cooling cost matters most - its SEER2 is below average for central heat pumps.
      • You mainly need heat - its HSPF2 is below average for central heat pumps.

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandMaytag
      Outdoor unit modelPSH4BF5M2SX48K
      SeriesMAYTAG PSH4BF SERIES
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 19, 2024
      Last certifiedApril 9, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 16.0)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity45,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.0
      Capacity at 47°F45,500-46,000 BTU/h
      Capacity at 17°F28,000-31,000 BTU/h
      Capacity at 5°F23,400-25,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75
      ENERGY STAR cold climateNo
      Heating output as it gets colder51% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with B65VMMX3648K*C at the standard test temperatures, in BTU/h:

      Certified matchups3 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      B65VMMX3648K*C-16.011.78.023,400217194126
      C75B(A,H)MX4860C*CPGC2T(*)V(*)C(*)16.011.78.025,000217196710
      C75B(A,H)MX4860C*DPGC2T(*)V(*)D(*)16.011.78.025,400217196711
      Yearly running cost in 10 large cities$1,337-$3,589

      At each state's average electricity price and the city's typical heating and cooling hours.

      Questions5
      What is the SEER2 rating of the Maytag PSH4BF5M2SX48K?
      The Maytag PSH4BF5M2SX48K is rated at up to 16.0 SEER2 and 11.7 EER2 for cooling and up to 8.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Maytag PSH4BF5M2SX48K good for cold climates?
      It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 4-ton model.
      How much does the Maytag PSH4BF5M2SX48K cost to run per year?
      At its rated efficiency it costs about $1,337-$3,589 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,650 in Phoenix and $3,000 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Which indoor units work with the Maytag PSH4BF5M2SX48K?
      ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use B65VMMX3648K*C, C75B(A,H)MX4860C*C, C75B(A,H)MX4860C*D.
      What refrigerant does the Maytag PSH4BF5M2SX48K use?
      It uses R-454B.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $1,638/yrYou save $708/yrSee details ↓
      1. Where you live
      Adjust heating and cooling hours

      Filled in from your city's climate. Change them if you run the system much more or less than usual.

      2. The heat pump Maytag PSH4BF5M2SX48K
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,638
      Current system, per year
      $2,346
      You save per year
      $708
      Payback
      24.0 years
      Net after 10 years
      -$9,919

      Cooling $1,001Heating $637Electricity used: 10,238 kWhSaved vs. a minimum-efficiency heat pump: $161

      Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 9, 2025. How we use the data.